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Non Purchased Loans - Aging of Past Due and Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | $ 9,086,256 | $ 7,623,663
Unearned income | (3,127) | (3,341)
Loans, net of unearned income | 9,083,129 | 7,620,322
Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,295,912 | 1,039,393
Loans, net of unearned income | 1,295,912 | 1,039,393
Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 64,992 | 57,354
Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 740,668 | 633,389
Loans, net of unearned income | 740,668 | 633,389
Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 2,795,343 | 2,343,721
Loans, net of unearned income | 2,795,343 | 2,343,721
Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 4,051,509 | 3,427,530
Loans, net of unearned income | 4,051,509 | 3,427,530
Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 137,832 | 122,276
Loans, net of unearned income | 199,697 | 176,289
Non-Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 6,392,839 | 5,591,897
Unearned income | (3,127) | (3,341)
Loans, net of unearned income | 6,389,712 | 5,588,556
Non-Purchased | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 6,359,292 | 5,558,312
Unearned income | (3,127) | (3,341)
Loans, net of unearned income | 6,379,494 | 5,578,306
Non-Purchased | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 17,517 | 16,979
Non-Purchased | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 2,685 | 3,015
Non-Purchased | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 2,814 | 4,129
Unearned income | 0 | 0
Loans, net of unearned income | 10,218 | 10,250
Non-Purchased | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 241 | 206
Non-Purchased | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 7,163 | 5,915
Non-Purchased | Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 875,649 | 763,823
Non-Purchased | Commercial, financial, agricultural | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 870,457 | 759,143
Total loans, gross | 874,121 | 761,887
Non-Purchased | Commercial, financial, agricultural | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 3,397 | 2,722
Non-Purchased | Commercial, financial, agricultural | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 267 | 22
Non-Purchased | Commercial, financial, agricultural | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 172 | 698
Total loans, gross | 1,528 | 1,936
Non-Purchased | Commercial, financial, agricultural | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 205
Non-Purchased | Commercial, financial, agricultural | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 1,356 | 1,033
Non-Purchased | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 64,992 | 57,354
Non-Purchased | Lease financing | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 64,296 | 57,148
Total loans, gross | 64,992 | 57,195
Non-Purchased | Lease financing | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 607 | 47
Non-Purchased | Lease financing | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 89 | 0
Non-Purchased | Lease financing | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 159
Non-Purchased | Lease financing | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Non-Purchased | Lease financing | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 159
Non-Purchased | Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 635,519 | 547,658
Non-Purchased | Real estate – construction | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 634,632 | 547,608
Total loans, gross | 635,519 | 547,658
Non-Purchased | Real estate – construction | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 887 | 50
Non-Purchased | Real estate – construction | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Non-Purchased | Real estate – construction | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 0 | 0
Total loans, gross | 0 | 0
Non-Purchased | Real estate – construction | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Non-Purchased | Real estate – construction | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Non-Purchased | Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 2,087,890 | 1,729,534
Non-Purchased | Real estate – 1-4 family mortgage | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 2,071,401 | 1,712,982
Total loans, gross | 2,083,930 | 1,726,986
Non-Purchased | Real estate – 1-4 family mortgage | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 10,378 | 11,810
Non-Purchased | Real estate – 1-4 family mortgage | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 2,151 | 2,194
Non-Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 1,046 | 730
Total loans, gross | 3,960 | 2,548
Non-Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 238 | 0
Non-Purchased | Real estate – 1-4 family mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 2,676 | 1,818
Non-Purchased | Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 2,628,365 | 2,390,076
Non-Purchased | Real estate – commercial mortgage | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 2,621,902 | 2,381,871
Total loans, gross | 2,623,795 | 2,384,519
Non-Purchased | Real estate – commercial mortgage | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 1,880 | 1,921
Non-Purchased | Real estate – commercial mortgage | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 13 | 727
Non-Purchased | Real estate – commercial mortgage | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 1,596 | 2,680
Total loans, gross | 4,570 | 5,557
Non-Purchased | Real estate – commercial mortgage | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Non-Purchased | Real estate – commercial mortgage | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 2,974 | 2,877
Non-Purchased | Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 100,424 | 103,452
Non-Purchased | Installment loans to individuals | Accruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 99,731 | 102,901
Total loans, gross | 100,264 | 103,402
Non-Purchased | Installment loans to individuals | Accruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 368 | 429
Non-Purchased | Installment loans to individuals | Accruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 165 | 72
Non-Purchased | Installment loans to individuals | Nonaccruing Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current Loans | 0 | 21
Total loans, gross | 160 | 50
Non-Purchased | Installment loans to individuals | Nonaccruing Loans | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 3 | 1
Non-Purchased | Installment loans to individuals | Nonaccruing Loans | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | $ 157 | $ 28

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